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A kind of Al-mg-Si-cu alloy for automobile body with high strength and rapid hardening and preparation method thereof

A rapid hardening, automobile body technology, applied in the field of aluminum alloy materials, to achieve the effect of high corrosion resistance, high aging strength and low yield strength

Active Publication Date: 2019-03-19
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The root cause of this phenomenon is that only the influence of Mg / Si or Cu content on alloy texture properties has been clarified, but the properties of 6000 series aluminum alloys are mainly determined by the joint influence of Mg / Si and Cu, while Mg / Si and Cu The effect of Cu co-variation on the structure and properties of alloys has not been clearly understood

Method used

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  • A kind of Al-mg-Si-cu alloy for automobile body with high strength and rapid hardening and preparation method thereof
  • A kind of Al-mg-Si-cu alloy for automobile body with high strength and rapid hardening and preparation method thereof
  • A kind of Al-mg-Si-cu alloy for automobile body with high strength and rapid hardening and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] An excess Mg high Cu alloy consists of the following components by mass: Mg: 1.17wt.%; Si: 0.57wt.%, Cu: 0.5wt.%, Mn: 0.06wt.%, Fe: 0.17wt.% , and the rest are Al.

[0028] The alloy uses 99.98% industrial pure aluminum, pure Mg, Al-Si master alloy and Al-Cu master alloy as raw materials. Under the condition of melting temperature of 660°C, first add industrial pure aluminum and then add Al-Si after it is completely melted. Master alloy: Add Al-Cu master alloy after complete melting, add pure Mg after complete melting, ensure that the melt is evenly mixed, pour the melt into water-cooled steel molds with length, width and height of 300mm, 200mm, and 60mm respectively. , and then cut the head of the ingot, and then carry out homogenization treatment, solid solution water quenching, and aging treatment in sequence. The cold-rolled sheet is firstly subjected to solution treatment at 560°C for 30 minutes, then water quenched to room temperature, and then subjected to three...

Embodiment 2

[0047] An excess Mg high Cu alloy consists of the following components by mass: Mg: 1.17wt.%, Si: 0.57wt.%, Cu: 0.5wt.%, Mn: 0.06wt.%, 0.17wt.%, the rest for Al.

Embodiment 3

[0049] An excess Mg high Cu alloy consists of the following components by mass: Mg: 1wt.%, Si: 0.3wt.%, Cu: 1.5wt.%, Mn: 0.20wt.%, Fe: 0.1wt.%, The rest is Al.

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Abstract

The invention relates to a new high-strength quick-hardened Al-Mg-Si-Cu alloy used for an automobile body and a preparation method of the alloy. The alloy comprises the following components, by mass, 1-2.8 wt% of Mg, 0.3-1 wt% of Si, 0.5-1.5 wt% of Cu, wherein the ratio of Mg to Si in the alloy is more than 2, no more than 0.5 wt% of Mn, and no more than 0.2 wt% of Fe, with the balance being Al. Through increase of the ratio of Mg to Si and the Cu content, a new excessive-Mg high-Cu 6000-series aluminium alloy taking a disordered L phase as a main hardening constituent is designed. Compared with an AA6022 alloy widely applied in the industry at the present, the alloy is relatively low in T4-state yield strength, has high precipitation dynamics, baking hardenability and thermal stability during artificial aging, has no influence on corrosion resistance, and has great potential for application to an outer plate of an automobile body.

Description

technical field [0001] The invention relates to an aluminum alloy material, in particular to a novel high-strength and rapidly hardening Al-Mg-Si-Cu alloy for automobile bodies and a preparation method thereof. Background technique [0002] Lightweight vehicles are one of the most effective measures to reduce energy consumption and emissions. Relevant research shows that every 10% reduction in vehicle weight can reduce fuel consumption by 6% to 8% and reduce emissions by 4%. International advanced automobile companies have made great progress in realizing the lightweight of the whole vehicle through the selection of lightweight materials, and aluminum alloy materials are currently the preferred lightweight materials. The 6000 series aluminum alloy has medium to high strength, good formability and corrosion resistance, good weldability, high surface quality after baking, and can be strengthened by heat treatment. It is currently the key material for lightweight automobile bod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/08C22C21/14C22C21/16C22C1/03C22F1/047C22F1/057
CPCC22C1/026C22C1/03C22C21/08C22C21/14C22C21/16C22F1/002C22F1/047C22F1/057
Inventor 贾志宏丁立鹏邹芸翁瑶瑶刘庆
Owner CHONGQING UNIV
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